Investments - Allowance for Credit Losses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Receivables	Receivables
Accrued interest receivables on available-for-sale fixed maturity securities	$ 442	$ 435
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Beginning balance	16	1
Securities for which credit losses were not previously recorded	27	17
Available-for-sale securities accounted for as PCD assets	4	22
Securities sold during the period (realized)	4	6
Intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis	1	8
Write-offs charged against the allowance	9	15
Additional increases to the allowance for credit losses on securities that had an allowance recorded in a previous period	12	5
Ending balance	45	16
Corporate bonds and other
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Beginning balance	4	0
Securities for which credit losses were not previously recorded	9	10
Available-for-sale securities accounted for as PCD assets	4	22
Securities sold during the period (realized)	3	6
Intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis	1	8
Write-offs charged against the allowance		15
Additional increases to the allowance for credit losses on securities that had an allowance recorded in a previous period		1
Ending balance	13	4
Asset-backed
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Beginning balance	12	1
Securities for which credit losses were not previously recorded	18	7
Available-for-sale securities accounted for as PCD assets
Securities sold during the period (realized)	1
Intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis
Write-offs charged against the allowance	9
Additional increases to the allowance for credit losses on securities that had an allowance recorded in a previous period	12	4
Ending balance	$ 32	$ 12